1. Division of Radiation Oncology, Department of Radiology, Far Eastern Memorial Hospital, New Taipei City 220, Taiwan
2. Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 404, Taiwan
3. Department of Radiation Oncology, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan
4. Department of Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
5. Institute of Traditional Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan